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Wattmeter failure

Discussion in 'Electronic Repair' started by Andre Majorel, Jul 25, 2012.

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  1. Left a 400 W dehumidifier running off a wattmeter. After a week
    or two, the dehumidifier didn't work any more. The fan is on but
    when the compressor tries to start, the display jumps to about
    1200 W for a couple seconds, a click is heard (maybe a klixon)
    and that's it.

    The dehumidifier works fine without the wattmeter.

    The wattmeter now reads 300+ W for three 36 W FT when it used
    the read about 140 W.

    Is this a well-known failure mode ? Bad shunt ?

    Thanks in advance.
     
  2. tm

    tm Guest

    RoHS strikes again.
     
  3. mike

    mike Guest

    You've asked for help with the failure modes of a wattmeter while
    giving no, zero, not any clues as to what kind of wattmeter.

    It's like asking, "What's wrong with my car?" It doesn't work any more.
     
  4. The manual only says 16 A / 3680 W (I'm not in 115 V-land).
    The shunt appears to be a cm-long piece of copper alloy wire, no
    markings, CSA about 1 mm². When my free time becomes copious
    again, I'll try to compare its resistance with a not-yet fried
    unit.

    Thanks everyone.
     
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